[ovirt-users] Snapshots - Preview button greyed out

Hi Everyone, I am encountering an issue on my oVirt 4.2 self-hosted engine installation. Suddenly the "Preview" button in snapshots menu became inactive, I just cannot revert any previews snapshots. This feature worked fine over the last month, but now it seems to be just inactive. Any thoughts on this ? Thank you very much ! Leo -- Best regards, Leo David